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The CSIRO-GEMOC Nuclear Microprobe

System Overview

Lens System

Quadrupole Design

Quintuplet Configuration

Beam Shaping Controls

Scanning, Beam Deflection


Data Acquisition and Analysis

Target Chamber

End triplet picture

Return to NMP microanalysis

Lens System

The NMP uses a magnetic quadrupole lens system to focus ion beams from the accelerator. Two distinguishing features of the new lens system are the design of each quadrupole lens element and the unique quintuplet, a distributed 5 lens configuration [1-4].

NMP lens-detector-target geometry

The quadrupole yokes are shaped with pole-tip extensions, and yoke cut-outs between poles for symmetric detector ports at 135°. The result is large detector solid-angle, normal viewing microscope and a reduced effective lens working distance of 80 mm despite a large yoke outer diameter of 270 mm.

These new quadrupole quintuplet lens systems are being manufactured by, and are available through, MARCO, Melbourne.

[1] C.G. Ryan, D.N. Jamieson, W.L. Griffin, G. Cripps and R. Szymanski, "The New CSIRO-GEMOC Nuclear Microprobe: First Results, Performance and Recent Applications", Nucl. Instr. Meth. B181 (2001) 12-19.

[2] C.G. Ryan and D.N. Jamieson, "A high performance quadrupole quintuplet lens system for the CSIRO-GEMOC Nuclear Microprobe", Nucl. Instr. Meth. B158 (1999) 18-23.

[3] C.G. Ryan, D.N. Jamieson, W.L. Griffin and G. Cripps, "The CSIRO-GEMOC Nuclear Microprobe: A high-performance system based on a new closely integrated design", Nucl. Instr. Meth. B158 (1999) 97-106.

[4] C.G. Ryan, D.N. Jamieson, W.L. Griffin, S.H. Sie, G. Cripps and G.F. Suter, "The new CSIRO-GEMOC Nuclear Microprobe: A new highly integrated design for geoscience applications", proc. 10th Australian Conf. on Nuclear Techniques of Analysis, Canberra, ISSN 1329-8437 (1997) NTA/VSA8.

For further information contact: Dr. Chris Ryan via email: (
Phone +61-3-9905 9087
Fax orders +61-7-3327 4455
CSIRO Exploration and Mining
Bayview Road, Clayton VIC 3168
CSIRO Australia

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